package com.whl.cloud.common.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;

@Configuration
public class SpringUtil implements ApplicationContextAware {

	private static ApplicationContext applicationContext = null;
	
	private static Environment env;

	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		if (SpringUtil.applicationContext == null) {
			SpringUtil.applicationContext = applicationContext;
			env = applicationContext.getEnvironment();
		}
	}

	//获取applicationContext
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	//通过name获取 Bean.
	public static Object getBean(String name) {
		return getApplicationContext().getBean(name);
	}
	
	//通过class获取Bean.
	public static <T> T getBean(Class<T> clazz) {
		return getApplicationContext().getBean(clazz);
	}

	//通过name,以及Clazz返回指定的Bean
	public static <T> T getBean(String name, Class<T> clazz) {
		return getApplicationContext().getBean(name, clazz);

	}
	
	public static void publishEvent(ApplicationEvent event){
		getApplicationContext().publishEvent(event);
	}

	public static Environment env() {
		return env;
	}

}
